On-line specs on some of the car shopping web-sites made mention of it and also refer to it as an 'air conditioning filter'. I got to thinking about it because everytime I turn the clmate control on 'Auto' the system always switches to outside air for the cabin.
Our SX4 has one, so I assume that the flagship car would also have one. I checked the manual and found nothing. Checked the partial service manual here on the forum and found nothing.

